Portable spray arm



FIG. 1 is a perspective view of a portable spray arm illustrating my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is front elevational view thereof;

FIG. 5 is a right side elevational view thereof, the left side being a mirror image of the right side shown; and

FIG. 6 is a rear elevational view thereof. 

The ornamental design for the portable spray arm, as shown and described. 